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UNT Libraries Government Documents Department
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A 1 MEGAWATT POLYPHASE BOOST CONVERTER-MODULATOR FOR KLYSTRON PULSE APPLICATION
This paper describes electrical design criteria and first operational results a 140 kV, 1 MW average, 11 MW peak, zero-voltage-switching 20 kHz polyphase bridge, boost converter/modulator for klystron pulse application. The DC-DC converter derives the buss voltages from a standard 13.8 kV to 2300 Y substation cast-core transformer. Energy storage and filtering is provided by self-clearing metallized hazy polypropylene traction capacitors. Three ''H-Bridge'' Insulated Gate Bipolar Transistor (IGBT) switching networks are used to generate the polyphase 20 kHz transformer primary drive waveforms. The 20 kHz drive waveforms are chirped the appropriate duration to generate the desired klystron pulse width. PWM (pulse width modulation) of the individual 20 kHz pulses is utilized to provide regulated output waveforms with adaptive feedforward and feedback techniques. The boost transformer design utilizes amorphous nanocrystalline material that provides the required low core loss at design flux levels and switching frequencies. Resonant shunt-peaking is used on the transformer secondary to boost output voltage and resonate transformer leakage inductance. With the appropriate transformer leakage inductance and peaking capacitance, zero-voltage-switching of the IGBT's is attained, minimizing switching losses. A review of these design parameters and the first results of the performance characteristics will be presented.
Date:
June 1, 2001
Creator:
Reass, W. A.; Doss, J. D. & Gribble, R. F.
Object Type:
Article
System:
The UNT Digital Library
Acoustic Monitor for Liquid Solid Slurries Measurements at Low Weight Fractions
The principal objective of the project is to develop an acoustic probe for determining the volume fraction of particles in a flowing suspension. This will include testing the theory of acoustic wave propagation in suspensions and demonstrating the application of the probe by installing it on a flow loop through which a suspension is flowing and determining the particle volume fraction. The signal from the probe must be processed such that the noise arising from the presence of the gas bubbles, if present in the system, is removed to yield an accurate estimate of the particle volume fraction. Once the probe is developed and tested successfully at Syracuse University, it is to be installed and tested in the flow loop at Oak Ridge National Laboratories for surrogate slurries for the Hanford Nuclear site. Particular attention is to be given to testing suspensions with low particle volume fractions since slurries to be transported in nuclear waste processing will have low particle volume fractions.
Date:
June 1, 2001
Creator:
Taularides, L. L. & Sangani, A.
Object Type:
Report
System:
The UNT Digital Library
ACTINIDE-ALUMINATE SPECIATION IN ALKALINE RADIOACTIVE WASTE
Highly alkaline radioactive waste tanks contain a number of transuranic species, in particular U, Np, Pu, and Am--the exact forms of which are currently unknown. Knowledge of actinide speciation under highly alkaline conditions is essential towards understanding and predicting their solubility and sorption behavior in tanks, determining whether chemical separations are needed for waste treatment, and designing separations processes. Baseline washing of tank sludges with NaOH solutions is being proposed to reduce the volume of HLW. Alkaline pretreatment of HLW will be needed to remove aluminum [as NaAl(OH){sub 4}] because it significantly reduces the HLW volume; however, aluminate [Al(OH){sub 4}{sup -}] enhances actinide solubility via an unknown mechanism. Thus, alkaline wash residues may require an additional treatment to remove actinides. The results of this research will determine the nature TRU (Np, Pu, Am) speciation with aluminate anions under alkaline, oxidizing tank-like conditions. Specific issues to be addressed include solubility of these actinides, speciation in aluminate-containing alkaline supernatants, the role of actinide redox states on solubility, and partitioning between supernatant and solid phases, including colloids. Studies will include thermodynamics, kinetics, spectroscopy, electrochemistry, etc. It is already known, for example, that certain high valent forms of NF and Pu are very soluble …
Date:
June 1, 2001
Creator:
Clark-Deaborg, David
Object Type:
Report
System:
The UNT Digital Library
Adaptive response against spontaneous neoplastic transformation induced by low dose ionizing radiation
This project is being conducted to ascertain the shape of the dose response curve for neoplastic transformation in vitro over the dose range 0.0 to 10 cGy, and to determine how this depends on radiation quality and dose fractionation. Preliminary data already have indicated that at a dose of 1 cGy the induced transformation frequency is less than the spontaneous transformation frequency. The results will be compared with animal and human epidemiological data on the induction of cancer by low doses of radiation. This will hopefully allow for a more informed estimation of the risk of cancer induction at low doses.
Date:
June 1, 2001
Creator:
Redpath, J. Leslie
Object Type:
Report
System:
The UNT Digital Library
ADTF SUPERCONDUCTING LINAC DESIGN
None
Date:
June 1, 2001
Creator:
GARNETT, R. W.
Object Type:
Article
System:
The UNT Digital Library
The Age, Volume 24, Number 6, June 2001
Monthly publication containing information related to Chambers County, Texas, including current events of the Chambers County Historical Commission, the Wallisville Heritage Park, and the Chambers County historical and genealogical societies; reprinted newspaper articles about county events and citizens; and historical news and records.
Date:
June 2001
Creator:
Wallisville Heritage Park (Organization)
Object Type:
Journal/Magazine/Newsletter
System:
The Portal to Texas History
Agent-based modeling of complex infrastructures
Complex Adaptive Systems (CAS) can be applied to investigate complex infrastructures and infrastructure interdependencies. The CAS model agents within the Spot Market Agent Research Tool (SMART) and Flexible Agent Simulation Toolkit (FAST) allow investigation of the electric power infrastructure, the natural gas infrastructure and their interdependencies.
Date:
June 2001
Creator:
North, M. J.
Object Type:
Article
System:
The UNT Digital Library
AHF BEAMS TRANSPORT LATTICE CRYOSYSTEMS[Advanced Hydrotest Facility]
None
Date:
June 1, 2001
Creator:
KELLEY, J. P. & MULHOLLAND, G. T.
Object Type:
Article
System:
The UNT Digital Library
AHF MAGNETIC LENS CRYOSYSTEMS[Advanced Hydrotest Facility]
None
Date:
June 1, 2001
Creator:
KELLEY, J. P. & MULHOLLAND, G. T.
Object Type:
Article
System:
The UNT Digital Library
Air Quality Forecasting: A Review of Federal Programs and Research Needs
This report provides a brief overview of the state of science of air quality forecasting. The report was composed to guide future federal research in air quality forecasting.
Date:
June 2001
Creator:
National Science and Technology Council (U.S.). Air Quality Research Subcommittee.
Object Type:
Text
System:
The UNT Digital Library
Altus Times (Altus, Okla.), Vol. 102, No. 68, Ed. 1 Friday, June 1, 2001
Daily newspaper from Altus, Oklahoma that includes local, state, and national news along with advertising.
Date:
June 1, 2001
Creator:
Bush, Michael
Object Type:
Newspaper
System:
The Gateway to Oklahoma History
ANALOG FRONT-END ELECTRONICS FOR BEAM POSITION MEASUREMENT ON THE BEAM HALO MEASUREMENT
Enhancements have been made to the log-ratio analog front-end electronics based on the Analog Devices 8307 logarithmic amplifier as used on the LEDA accelerator. The dynamic range of greater than 85 dB, has been extended to nearly the full capability of the AD8307 from the previous design of approximately 65 dB through the addition of a 350 MHz band-pass filter, careful use of ground and power plane placement, signal routing, and power supply bypassing. Additionally, selection of high-isolation RF switches (55dB) has been an integral part of a new calibration technique, which is fully described in another paper submitted to this conference. Provision has also been made for insertion of a first-stage low-noise amplifier for using the circuit under low-signal conditions.
Date:
June 1, 2001
Creator:
SHURTER, R.B.; COTE, T.J. & GILPATRICK, J.D.
Object Type:
Article
System:
The UNT Digital Library
Analysis of coupling impedance bench measurements using Bethe's diffraction theory
In this paper we study the validity of coupling impedance bench measurements, comparing two of the most commonly used formulas to the result obtained, applying a modified version of Bethe's theory of diffraction to a lumped impedance in a coaxial beam pipe. The equations found provide a quantitative expression for the influence of the wire thickness used in the measurement of the real and imaginary part of the longitudinal impedance. The precision achievable in an actual measurement is therefore discussed. The method presented can also be applied in the presence of distributed impedances as well as to the analysis of transverse impedance measurements.
Date:
June 1, 2001
Creator:
De Santis, Stefano
Object Type:
Article
System:
The UNT Digital Library
Analysis of Plasma Dust Particle Crystals Confined within a Potential Well
None
Date:
June 1, 2001
Creator:
RILEY,MERLE E. & HEBNER,GREGORY A.
Object Type:
Report
System:
The UNT Digital Library
Analysis of Yucca Mountain Pore-Water Chloride Data
Distribution of chemical constituents in the unsaturated zone (UZ) system of Yucca Mountain, Nevada, depends on many factors, such as hydrological and geochemical processes of surface precipitation, evapotranspiration, the water-fracture-matrix interactions, large-scale mixing via lateral flow and transport, and the history of climate changes. This study analyzes pore-water chloride-concentration data and models the transport processes. The model results are then used to calibrate the UZ flow model with the aim of refining the infiltration distribution and percolation fluxes to the potential repository. The major chemical data used in this study were pore-water chloride (Cl) concentrations. The sensitivity of this conservative tracer to the UZ flow system is well known. This constituent was directly incorporated into a three-dimensional dual-permeability flow model. Chemical transport properties were taken into account. The surface flux of chloride was determined by the total amount of precipitation reaching the surface and chemical concentration in the precipitation. The entire flow system was divided into domains based on the distribution of pore-water chemical data, infiltration data, hydrogeological and hydrostructural features. Model calibration proceeded by adjusting the site-scale infiltration map and anisotropy permeabilities to reach a satisfying agreement between the simulated subsurface chloride distribution and measured data.
Date:
June 1, 2001
Creator:
Liu, Jianchun; Sonnenthal, Eric & Bodvarrson, Bo
Object Type:
Report
System:
The UNT Digital Library
Annual Birding & Nature Festivals of Texas: 2001-2002
Annual guide listing festivals in the state of Texas that are related to birds or other wildlife, providing descriptions, dates, and contact information.
Date:
June 2001
Creator:
Texas. Parks and Wildlife Department.
Object Type:
Pamphlet
System:
The Portal to Texas History
Annual report of waste generation and pollution prevention progress 2000 [USDOE] [9th edition]
This ninth edition of the Annual Report of Waste Generation and Pollution Prevention Progress highlights waste reduction, pollution prevention accomplishments, and cost savings/avoidance for the U.S. Department of Energy (DOE) Pollution Prevention Program for Fiscal Year 2000. This edition marks the first time that progress toward meeting the 2005 Pollution Prevention Goals, issued by the Secretary of Energy in November 1999, is being reported. In addition, the Annual Report has a new format, and now contains information on a fiscal year basis, which is consistent with other DOE reports.
Date:
June 1, 2001
Creator:
unknown
Object Type:
Report
System:
The UNT Digital Library
ANOMALOUS EFFECTS OF ALLOYING WITH NIOBIUM ON YIELD STRENGTH OF MOLYBDENUM DISILICIDE
None
Date:
June 1, 2001
Creator:
SHARIF, A.; MISRA, A. & AL, ET
Object Type:
Article
System:
The UNT Digital Library
An apolipoprotein influencing triglycerides in humans and mice revealed by comparative sequencing
None
Date:
June 1, 2001
Creator:
Pennacchio, Len A.; Olivier, Michael; Hubacek, Jaroslav A.; Cohen, Jonathan C.; Cox, David R.; Fruchart, Jean-Charles et al.
Object Type:
Article
System:
The UNT Digital Library
THE APPLICATION OF FIXED AND RANDOM ERROR TO SHIPPER/RECEIVER DIFFERENCES
In order to determine if a statistically significant difference exists between shipper and receiver measurements, a statistical combination of the shipper's and receiver's limit-of-error (LOE) is calculated to determine the shipper/receiver limit-of-error, LOES/R. The shipper's and receiver's LOE may possess random and systematic components. Depending on the interpretation of the systematic and random components, the determination of the LOES/R can be performed by several different calculational methods. These calculational methods and their associated underlying assumptions are reviewed in the context of the LANL shipper receiver program. This paper, by presenting the assumptions that form the basis of a site-specific shipper/receiver difference calculation, can assist those individuals responsible for calculating LOES/R.
Date:
June 1, 2001
Creator:
SCOTT, B. G.
Object Type:
Article
System:
The UNT Digital Library
AN APPLICATION OF GAME THEORY: FUNDING INTERDEPENDENT MC and A UPGRADE DECISIONS
Funding Material, Control and Accountability (MC&A) system upgrades has been identified as a partial solution for mitigating the diversion threat of weapons-grade nuclear material. Effective MC&A system upgrades are dependent on appropriate decisions based on based on funding, implementation, operation and oversight. Traditional MC&A upgrade decisions inherently assumed that all decision-makers possessed similar payoff vectors allowing for a fairly consistent and unified approach to MC&A system enhancements; however, MC&A upgrade projects in non-traditional environments may be required to take into account situations where the potential payoff vectors among decision-makers may be significantly different. Once a decision-maker is required to take into account the decisions of others, the process can be modeled as a game. Game theory has been previously be used to shed light on many aspects of social and economic behavior where a payoff from a set of strategies is dependent on the strategy of others. In this paper, the application of game theory in the context of MC&A upgrades is discussed. Various MC&A upgrades decision payoff matrices for relevant circumstances are evaluated for static (simultaneous) and dynamic (sequential decisions) games. Optimal strategies and equilibrium conditions for these payoff matrices are analyzed. Additional game factors (bargaining, uncertain outcomes, moral …
Date:
June 1, 2001
Creator:
SCOTT, B. G.
Object Type:
Article
System:
The UNT Digital Library
THE APPLICATION OF GAME THEORY TO STATISTICAL SAMPLING PLANS
None
Date:
June 1, 2001
Creator:
SCOTT, B. G.
Object Type:
Article
System:
The UNT Digital Library
APPLYING MICRO-MECHANICS TO FINITE ELEMENT SIMULATIONS OF SPLIT HOPKINSON PRESSURE BAR EXPERIMENTS ON HIGH EXPLOSIVES
None
Date:
June 2001
Creator:
Mas, E. M. & Clements, B. E.
Object Type:
Article
System:
The UNT Digital Library
Approach for enhancing nuclear materials tracking and reporting in waste
Recent policy from the Department of Energy/Office of Safeguards and Security (DOE/OSS) has identified the need to report nuclear materials in waste in a manner that is consistent with the Department of Energy's Nuclear Materials Information System (NMIS), which uses Form 471 as its official record. NMIS is used to track nuclear material inventories while they are subject to safeguards. This requirement necessitates the reevaluation of existing business practices that are used to track and report these nuclear materials. This paper provides a methodology for applying a systems approach to the evaluation of the flow of nuclear waste materials from a generating facility through to permanent disposal. This methodology can be used to integrate existing systems and leverage data already gathered that support both the waste reporting requirements and the NMIS requirements. In order to consider an active waste reporting system that covers waste management through to final disposal, the requirements for characterization, certification, and transportation for disposal at the Waste Isolation Pilot Plant (WIPP) are used as an example. These requirements are found in the WIPP Waste Acceptance Criteria (WIPP/WAC) and associated requirement documents. This approach will prevent inconsistencies in reported data and address current and future needs. For …
Date:
June 1, 2001
Creator:
Longmire, V. L. (Victoria L.); Seitz, S. L. (Sharon L.) & Sinkule, B. J. (Barbara J.)
Object Type:
Article
System:
The UNT Digital Library